The most critical job of a manager, when you boil it all down, is communication. To be successful, a manager has to be effective in communicating one-on-one, in writing and in groups. While weakness in any of these three disciplines will compromise the ability to lead, the weakness most often seen in managers is in group communication. And it's the most conspicuous.

Group communication can be one of a manager's most powerful assets. When presenting to a group, he or she has its full attention